Undefined function or variable 'a'.

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Scott
Scott 2016-5-3
评论： CS Researcher 2016-5-4
My current problem refers to the below script and function.
clear;
for x=100:145
assfunct1(x);
fprintf('x: %d, a: %d, b: %d, c: %d\n', x, a, b, c);
end;
&
function [a,b,c] = assfunct1(x)
if x<0 || fix(x) ~=x;
disp('error, input is not a non negative integer')
return
end
for a=1:x
b=sqrt(5*a^3);
c=sqrt((a+b)^2);
end
[a,b,c]
end
>> Assignment1
ans =
1.0e+03 *
0.1000 2.2361 2.3361
Undefined function or variable 'a'.
Error in Assignment1 (line 4)
fprintf('x: %d, a: %d, b: %d, c: %d\n', x, a, b, c);
Been trying for hours to work where I have erred, ty for any help you can offer.
  3 个评论
显示 1更早的评论
Scott
Scott 2016-5-4
yes that's a typo, the code is for assfunct1 in the script
CS Researcher
CS Researcher 2016-5-4
I answered this a few days back and as John correctly pointed out you should do this:
clear;
for x=100:145
[a,b,c] = assfunct1(x);
fprintf('x: %d, a: %d, b: %d, c: %d\n', x, a, b, c);
end;

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采纳的回答

John BG
John BG 2016-5-3
You have to collect the output of your custom function assfunct3() with a variable that then you have to feed in the fprintf.
Since you call assfunct3 but do not collect the result with anything, then fprintf does not really know what variable 'a' is because the 'a' you use in the header of the assfunct3 remains local to that function.
If you find this answer of any help solving your question,
please click on the thumbs-up vote link,
thanks in advance
John
jgb2012@sky.com

更多回答（1 个）

Jan
Jan 2016-5-3
You have to catch the outputs of the function:
for x = 100:145
[a, b, c] = assfunct3(x);
fprintf('x: %d, a: %d, b: %d, c: %d\n', x, a, b, c);
end
Note that the values of b and c are overwritten in each iteration:
for a = 1:x
b = sqrt(5*a^3);
c = sqrt((a+b)^2);
end
[a,b,c]
What is your intention?

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